EP3309292A1

EP3309292A1 - Filterless air-handling system for a heat pump laundry appliance

Info

Publication number: EP3309292A1
Application number: EP17196490.1A
Authority: EP
Inventors: Claudio Civanelli; Daniele Martinello
Original assignee: Whirlpool Corp
Current assignee: Whirlpool Corp
Priority date: 2016-10-14
Filing date: 2017-10-13
Publication date: 2018-04-18
Also published as: US11542653B2; US10738411B2; US20200332457A1; US20180105971A1

Abstract

A laundry appliance (12) includes a blower (26) that directs process air (16) along an airflow path (24). A condensing heat exchanger (28) heats the process air (16) to define heated process air (30). A drum receives the heated process air (30) to dry laundry. A pump directs fluid (18) along a fluid path (32). An evaporating heat exchanger (36) cools the fluid (18) to define a cooled fluid (38). A refrigerant circuit (50) directs a refrigerant (52) between the condensing and evaporating heat exchangers (28, 36). A shower area (40) in which the cooled fluid (38) is showered through the heated process air (30) after the heated process air (30) exits the drum to wash particulate matter (28) out of the heated process air (30). The pump directs the fluid (18) towards the evaporating heat exchanger (36) in order to cool the fluid (18), and directs the cooled fluid (38) to the shower area (40).

Description

BACKGROUND

The device is in the field of laundry appliances, and more specifically, laundry appliances having a heat pump system for operating a filterless air-handling system.

SUMMARY

In at least one aspect, a laundry appliance includes a blower that directs process air along an airflow path. A condensing heat exchanger heats the process air to define heated process air. A drum receives the heated process air to dry laundry. A pump directs fluid along a fluid path. An evaporating heat exchanger cools the fluid to define a cooled fluid. A refrigerant circuit directs a refrigerant between the condensing and evaporating heat exchangers. A shower area in which the cooled fluid is showered through the heated process air after the heated process air exits the drum to wash particulate matter out of the heated process air. The pump directs the fluid towards the evaporating heat exchanger in order to cool the fluid, and directs the cooled fluid to the shower area.
In at least another aspect, a thermal exchange system for an appliance includes a first heat exchange loop having condensing and evaporating heat exchangers. A second heat exchange loop heats process air at the condensing heat exchanger for delivery through a drum and a shower area, sequentially. A third heat exchange loop cools a fluid at the evaporating heat exchanger for delivery to the shower area. The shower area is defined by an interaction of the fluid with the process air leaving the drum to wash particulate matter from the process air leaving the drum and to cool and dehumidify the process air leaving the drum.
In at least another aspect, an air-handling system for an appliance includes an airflow path that directs process air through a condensing heat exchanger to define heated process air that is delivered through a rotating drum. A fluid path selectively directs a fluid through an evaporating heat exchanger to define cooled fluid, wherein the evaporating heat exchanger is in thermal communication with the condensing heat exchanger. A shower area defined by an intersection of the airflow path and the fluid path. The cooled fluid is delivered through the heated process air within the fluid shower to cool and dehumidify the heated process air and warm the cooled fluid. The cooled fluid washes particulate matter from the heated process air. The heated process air increases a fluid temperature of the cooled fluid.
These and other features, advantages, and objects of the present device will be further understood and appreciated by those skilled in the art upon studying the following specification, claims, and appended drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

In the drawings:

FIG. 1 is a front elevational view of a laundry appliance incorporating an aspect of the filterless air-handling system used in conjunction with a heat pump;
FIG. 2 is a schematic diagram illustrating an aspect of the heat pump and air-handling systems for a laundry appliance;
FIG. 3 is a schematic diagram illustrating operation of an aspect of the heat exchange loops for the thermal exchange system for the laundry appliance;
FIG. 4 is a schematic diagram of the appliance of FIG. 2 taken at area IV and illustrating operation of the third heat exchanger; and
FIG. 5 is a schematic diagram illustrating operation of the second heat exchanger of the appliance of FIG. 2.

DETAILED DESCRIPTION OF EMBODIMENTS

For purposes of description herein the terms "upper," "lower," "right," "left," "rear," "front," "vertical," "horizontal," and derivatives thereof shall relate to the device as oriented in FIG. 1. However, it is to be understood that the device may assume various alternative orientations and step sequences, except where expressly specified to the contrary. It is also to be understood that the specific devices and processes illustrated in the attached drawings, and described in the following specification are simply exemplary embodiments of the inventive concepts defined in the appended claims. Hence, specific dimensions and other physical characteristics relating to the embodiments disclosed herein are not to be considered as limiting, unless the claims expressly state otherwise.
As illustrated in FIGS. 1-5, reference numeral 10 generally refers to a heat pump system for operating a laundry appliance 12, where the laundry appliance 12 can be a washer, dryer or combination washer and dryer. The heat pump system 10 for the appliance 12 can be used as a thermal exchange system 14 for heating and cooling process air 16 and fluid 18, typically water, for use in performing the various laundry functions of the appliance 12. The laundry appliance 12 can include a rotating drum 20 for receiving one or more items 22 to be processed. An airflow path 24 of the appliance 12 includes a blower 26 that directs process air 16 through the rotating drum 20. The airflow path 24 is configured to intersect with a first heat exchanger, typically in the form of a condensing heat exchanger 28, that selectively increases an air temperature 112 of the process air 16 to define heated process air 30 that is selectively delivered through the rotating drum 20. A fluid path 32 includes a fluid pump 34 that directs fluid 18 to intersect with a second heat exchanger, typically in the form of an evaporating heat exchanger 36. The evaporating heat exchanger 36 selectively decreases the fluid temperature 114 of the fluid 18 to define a cooled fluid 38 that is delivered to a shower area 40. It is contemplated that the heated process air 30 and the cooled fluid 38 selectively intersect within the shower area 40 to define a third heat exchanger 42, typically in the form of the shower area 40 having a sprayer. Within this third heat exchanger 42, the cooled fluid 38 is heated by the heated process air 30 passing through the shower area 40. Simultaneously, the heated process air 30 is cooled by the cooled fluid 38 that passes through the shower area 40.
Referring again to FIGS. 1-5, the appliance 12 also includes a refrigerant circuit 50 that directs a refrigerant 52 between the condensing and evaporating heat exchangers 36. It is contemplated that the airflow path 24 and the process air 16 are free of direct engagement with the evaporating heat exchanger 36 and the fluid path 32 and the fluid 18 are free of direct engagement with the condensing heat exchanger 28.
Referring again to FIGS. 2-5, during operation of the appliance 12, the heated process air 30 is adapted to selectively extract moisture 60 from the items 22, such as damp fabric, within the rotating drum 20 to define moisture-laded process air 62 that is delivered to the shower area 40. As the moisture-laden process air 62 passes through the shower area 40, the cooled fluid 38 is sprayed into the shower area 40 to intermingle with the moisture-laden process air 62. The cooled fluid 38 decreases the air temperature 112 of the moisture-laden process air 62 and serves to condense and remove the moisture 60 from the moisture-laden process air 62. The process air 16 leaving the shower area 40, through the intermingling with the cooled fluid 38, is dehumidified to define a cool return air 64 that is returned to the condensing heat exchanger 28. The cool return air 64 includes less moisture, and, as will be described more fully below, less particulate matter 82, than that of the moisture-laden process air 62. Additionally, the intermingling of the moisture-laden process air 62 and the cooled fluid 38, raises the fluid temperature 114 of the cooled fluid 38 to define a heated return fluid 66 containing the condensed moisture 60 and particulate matter 82 that is directed back toward the evaporating heat exchanger 36.
Referring again to FIGS. 2-5, it is contemplated that the shower area 40, while serving to provide various moisture condensing functions to the moisture-laden process air 62, also defines a particulate filtration mechanism 80. This particulate filtration mechanism 80 serves to remove particulate matter 82 contained within the moisture-laden process air 62 by passing the cooled fluid 38 through the moisture-laden process air 62. Accordingly, the fluid 18 is showered through the moisture-laden process air 62 to wash out particulate matter 82 therefrom without the need for a screen, fabric sponge or other similar filter. The intersection of the cooled fluid 38 with the moisture-laden process air 62 serves to washout or otherwise capture various particulate matter 82 present within the moisture-laden process air 62. This particulate matter 82 is typically captured from the items 22 being processed in the rotating drum 20. In this manner, the heated return fluid 66 can include condensed moisture 60 that has been captured from the moisture-laden process air 62 and also the particulate matter 82 captured therefrom as well.
According to the various embodiments, it is contemplated that the heated return fluid 66 can be transmitted to a fluid tank 84 for recycling back through the evaporating heat exchanger 36 to be cooled into the cooled fluid 38 and subsequently pumped back to the shower area 40. It is also contemplated that during or after the performance of various laundry functions, the heated return fluid 66 containing the condensate and particulate matter 82 from the moisture-laden process air 62 can be removed from the appliance 12 through a drain 86 and/or drain pump or through removal of a removable compartment having the particulate matter 82 and fluid 18 contained therein. Through this operation of the particulate filtration mechanism 80, the cooled return air is substantially free of particulate matter 82 that may adhere to the condensing heat exchanger 28.
Referring again to FIGS. 1-5, the appliance 12 can include an air-handling system 100 where the airflow path 24 is directed through the rotating drum 20. The airflow path 24 is adapted to selectively direct process air 16 through the first heat exchanger that corresponds to the condensing heat exchanger 28. As the process air 16 moves through the condensing heat exchanger 28, the process air 16 is heated to define the heated process air 30 that is delivered through the rotating drum 20. This heated process air 30 serves to collect moisture 60 present within the wet or damp items 22, such as damp or wet clothing, contained therein. The fluid path 32 of the air-handling system 100 is adapted to selectively direct the fluid 18 through the second heat exchanger that corresponds to the evaporating heat exchanger 36. It is contemplated that the evaporating heat exchanger 36 is in thermal communication with the condensing heat exchanger 28, such as through the refrigerant circuit 50 or through some other thermal exchange mechanism defined between the condensing and evaporating heat exchangers 36. As the fluid 18 passes through the evaporating heat exchanger 36, the fluid 18 is cooled to define the cooled fluid 38 that is directed to the shower area 40.
According to the various embodiments, as exemplified in FIGS. 2-5, the air-handling system 100 includes the shower area 40 that is defined by an intersection of the airflow path 24 and the fluid path 32. Within this intersection, the cooled fluid 38 is selectively passed through the heated process air 30 within the shower area 40. Accordingly, the shower area 40 defines the third heat exchanger 42 that selectively transfers heat energy 110 from the heated process air 30 to the cooled fluid 38 to decrease the air temperature 112 of the heated process air 30 and simultaneously increase the fluid temperature 114 of the cooled fluid 38. As discussed above, this transfer of heat energy 110 can also serve to condense moisture 60 that has been captured by the heated process air 30 moving through the rotating drum 20. In this manner, the air leaving the rotating drum 20 can be defined as moisture-laden process air 62. The cooled fluid 38 passing through the moisture-laden process air 62 decreases the air temperature 112 of, and condenses the moisture 60 within, the moisture-laden process air 62. This condensed and removed moisture 60 can be delivered by the heated return fluid 66 to the fluid tank 84 for reuse within the fluid path 32. This moisture 60 can also be drained or otherwise removed from the appliance 12.
Referring again to FIGS. 2 and 3, it is contemplated that the evaporating heat exchanger 36 is dedicated for use in conjunction with the fluid path 32 and the fluid 18 delivered to the shower area 40. Accordingly, the evaporating heat exchanger 36 is free of direct contact with the airflow path 24 and the process air 16 moving therethrough. It is also contemplated that the condensing heat exchanger 28 is dedicated for use in connection with the airflow path 24 and the process air 16 moving therethrough to heat the air that is delivered to the rotating drum 20. Accordingly, the condensing heat exchanger 28 is free of direct contact with the fluid path 32 and the fluid 18 moved therethrough. It is contemplated that the condensing and evaporating heat exchangers 28, 36 do have indirect thermal communication with the fluid path 32 and airflow path 24, respectively, through the intersection of the process air 16 and fluid 18 within the shower area 40 that defines the third heat exchanger 42. This point of intersection at the third heat exchanger 42 is distal from the condensing and evaporating heat exchangers 28, 36.
According to the various embodiments, it is contemplated that the condensing and evaporating heat exchangers 28, 36 can be connected through a refrigerant circuit 50 that selectively delivers a refrigerant 52 between the condensing and evaporating heat exchangers 28, 36. Such a refrigerant circuit 50 can include a compressor 120, an expansion device 122, and the refrigerant 52 that can include a phase change material, such as Freon, water, and other similar phase change materials.
According to the various embodiments, in order to move the process air 16 through the airflow path 24 and the fluid 18 through the fluid path 32, the airflow path 24 can include a blower 26 that selectively recirculates process air 16 sequentially through the rotating drum 20, the shower area 40 and the condensing heat exchanger 28. The fluid path 32 can include a fluid pump 34 that selectively delivers fluid 18 from the second heat exchanger and to the shower area 40. It is contemplated that the fluid 18 can be delivered from the shower area 40 back to a fluid tank 84 and/or the evaporating heat exchanger 36 through the force of gravity or a secondary pump positioned within the fluid path 32.
Referring again to FIGS. 1-5, it is contemplated that the heat pump system 10 for the appliance 12 can be part of a thermal exchange system 14 that transfers heat energy 110 throughout various portions of the appliance 12. In this manner, the thermal exchange system 14 can be used for performing certain functions of the appliance 12 during treatment of various items 22 within the rotating drum 20. Such items 22 can include, but are not limited to, fabric, clothing, dishes, utensils and other similar items 22 that can vary depending on the nature of the appliance 12. It is contemplated that the thermal exchange system 14 can include a first heat exchange loop 130 that includes a first thermal transfer material 132 that is selectively delivered through the first and second heat exchangers. The thermal exchange system 14 can also include a second heat exchange loop 134 having a second thermal transfer material 136. This second thermal transfer material 136 is selectively delivered through the first heat exchanger (in the form of the condensing heat exchanger 28) and the third heat exchanger 42. It is contemplated that the second thermal transfer material 136 is selectively directed through a process chamber 138, such as a rotating drum 20, a stationary tub, an interior cavity, combinations thereof, and other similar interior processing spaces.
Referring again to FIGS. 2-5, within the process chamber 138, the second thermal transfer material 136 is adapted to extract and retain, at least temporarily, moisture 60 present within the process chamber 138. A third heat exchange loop 140 of the thermal exchange system 14 includes a third thermal transfer material 142. This third thermal transfer material 142 is selectively delivered through the second heat exchanger, in the form of the evaporating heat exchanger 36 and third heat exchanger 42.
According to the various embodiments, the third heat exchanger 42 is defined by the intersection of the second and third thermal transfer materials 136, 142. Additionally, the third thermal transfer material 142 is adapted to condense and precipitate the retained moisture 60 within the second thermal transfer material 136 and to remove at least a portion of the particulate matter 82 sequestered or otherwise retained within the second thermal transfer material 136.
It is contemplated that the second thermal transfer material 136 of the second heat exchange loop 134 can be process air 16 that is directed through the process chamber 138. The third thermal transfer material 142 can be the fluid 18 that is directed through the fluid sprayer 144 disposed proximate the third heat exchanger 42. In this embodiment, the second heat exchange loop 134 passes through the first heat exchanger, which again corresponds to the condensing heat exchanger 28. This condensing heat exchanger 28 heats the process air 16 to define the heated process air 30 that is delivered through the process chamber 138, typically in the form of the rotating drum 20. As the heated process air 30 moves through the third heat exchanger 42, this third heat exchanger 42 at least partially performs an evaporating function to cool the process air 16 and also condense moisture 60 contained within the process air 16. Accordingly, with respect to the second heat exchange loop 134, the third heat exchanger 42 acts as an evaporator 150 for the second heat exchange loop 134.
With respect to the third heat exchange loop 140, the fluid 18 pumped therethrough is cooled by the second heat exchanger, which typically corresponds to the evaporating heat exchanger 36. This cooled fluid 38 is directed to the fluid sprayer 144 of the third heat exchanger 42. With respect to the third heat exchange loop 140, the third heat exchanger 42 performs certain condensing functions such that the cooled fluid 38 is heated as it passes through the third heat exchanger 42. Accordingly, with respect to the third heat exchange loop 140, the third heat exchanger 42 is a condenser 152 that operates in conjunction with the evaporating heat exchanger 36 of the first heat exchange loop 130. In this manner, the third heat exchanger 42 of the thermal exchange system 14 of the appliance 12 simultaneously performs both condensing functions with respect to the third heat exchange loop 140 and evaporating functions with respect to the second heat exchange loop 134. In such an embodiment, the condensing, evaporating and third heat exchangers 28, 36, 42 of the thermal exchange system 14 transfer heat energy 110 in the form of heating and cooling to perform various processing functions of the appliance 12.
Stated another way, the condensing and third heat exchangers 28, 42 of the thermal exchange system 14 define a heater 160 and a cooling module 162, respectively, of the second heat exchange loop 134. Simultaneously, the evaporating and third heat exchangers 36, 42 define a cooling module 162 and a heater 160, respectively, of the third heat exchange loop 140.
According to the various embodiments, as exemplified in FIGS. 3-5, this continual transfer of heat energy 110 via the condensing, evaporating and third heat exchangers 28, 36, 42 of the thermal exchange system 14 for the appliance 12 efficiently utilizes the heating and cooling capacities of the condensing and evaporating heat exchangers 36 to perform the various washing and/or drying functions of the laundry appliance 12. Through the use of the thermal exchange system 14, heat energy 110 is transferred within the condensing heat exchanger 28 from the first thermal transfer material 132, typically a refrigerant 52, to the second thermal transfer material 136, typically the process air 16. Substantially all of this heat energy 110 is subsequently transferred again at the third heat exchanger 42 from the second thermal transfer material 136 to the third thermal transfer material 142, typically the fluid 18. As discussed above, this transfer of heat energy 110 within the third heat exchanger 42 performs the condensation and particulate filtration functions of the thermal exchange system 14. The heat energy 110 within the third thermal transfer material 142 is then transferred back to the first thermal transfer material 132 within the evaporating heat exchanger 36. This transfer of heat energy 110 between the condensing, evaporating and third heat exchangers 28, 36, 42 serves to conserve energy and makes the appliance 12 generally more efficient.
Referring again to FIG. 4, within the third heat exchanger 42, heat energy 110 within the process air 16 obtained from the condensing heat exchanger 28 is mingled with cooling contained within the cooled fluid 38. As discussed above, the cooling is generated by the extraction of heat from the fluid 18 at the evaporating heat exchanger 36. As discussed above, this mingling of the moisture-laden process air 62 with the cooled fluid 38 produces condensation and precipitation of moisture 60 within the moisture-laden process air 62. This removal of moisture 60 allows for the process air 16 to be recirculated through the condensing heat exchanger 28 and returned to the rotating drum 20 to capture additional moisture 60 from the items 22 being processed within the rotating drum 20.
According to the various embodiments, this removal of moisture 60 within the third heat exchanger 42 is possible through the separation of the process air 16 from direct contact with the evaporating heat exchanger 36. Instead, cooling, in the form of cooled fluid 38, from the evaporating heat exchanger 36 is delivered to the fluid sprayer 144 of the third heat exchanger 42. The cooled fluid 38 performs the evaporating functions to remove moisture 60 and particulate matter 82 with respect to the moisture-laden process air 62. Additionally, this condensing operation is also possible through the separation of the fluid path 32 from direct engagement with the condensing heat exchanger 28. Accordingly, the moisture condensation functions and particulate filtration, with respect to the moisture-laden air, as discussed above, are physically separated from both of the condensing and evaporating heat exchangers 28, 36.
According to the various embodiments, by separating the moisture condensation and particulate removal functions of the appliance 12 with respect to the moisture-laden process air 62 from each of the condensing and evaporating heat exchangers 28, 36, the particulate filtration mechanism 80 of the laundry appliance 12 can also be contained within the third heat exchanger 42, and physically separated from the condensing and evaporating heat exchangers 28, 36. By removing the particulate matter 82, such as lint, fluff, and other fibrous material obtained from the items 22 being processed within the rotating drum 20, this material is removed from the process air 16 before the process air 16 is returned to the condensing heat exchanger 28. This particulate matter 82 can also be removed from the fluid 18 before the fluid 18 is returned to the evaporating heat exchanger 36. Accordingly, this heat pump system 10 described herein allows for the absence of a screen-type filter while also unifying the filtration and moisture condensing functions of the appliance 12 within a single location of the third heat exchanger 42. In this manner, the third heat exchanger 42 is a compartment or area within the appliance 12 where process air 16 and fluid 18 can be combined to transfer heat energy 110 therebetween.
According to the various embodiments, the thermal exchange system 14 described herein can be incorporated within various appliances 12. These appliances 12 can include, but are not limited to, washers, dryers, combination washers and dryers, refrigerators, dish washers, freezers, and other similar appliances 12 that include a heat pump system 10 or other refrigerant-based thermal exchange system 14.

Claims

An air-handling system (100) for an appliance (12), the air-handling system (100) comprising:
an airflow path (24) that directs process air (16) through a condensing heat exchanger (28) to define heated process air (30) that is delivered through a rotating drum (20);

a fluid path (32) that selectively directs a fluid (18) through an evaporating heat exchanger (36) to define cooled fluid (38), wherein the evaporating heat exchanger (36) is in thermal communication with the condensing heat exchanger (28); and

a shower area (40) defined by an intersection of the airflow path (24) and the fluid path (32);

wherein the cooled fluid (38) is delivered through the heated process air (30) within the shower area (40) to cool and dehumidify the heated process air (30) and warm the cooled fluid (38);
the cooled fluid (38) washes particulate matter (82) from the heated process air (30); and

the heated process air (30) increases a fluid temperature (114) of the cooled fluid (38).
The air-handling system (100) of claim 1, wherein the condensing heat exchanger (28) is free of direct contact with the fluid (18) and the evaporating heat exchanger (36) is free of direct contact with the process air (16).
The air-handling system (100) of any one or more of claims 1 and 2, further comprising:
a refrigerant circuit (50) that selectively delivers a refrigerant (52) between the condensing and evaporating heat exchangers (28, 36), the refrigerant circuit (50) including a compressor (120) and an expansion device (122).
The air-handling system (100) of any one or more of claims 1-3, wherein the heated process air (30) moved through the rotating drum (20) is adapted to extract moisture from wet items disposed within the rotating drum (20) to define moisture-laden process air (16) that is selectively delivered to the shower area (40).
The air-handling system (100) of claim 4, wherein the shower area (40) includes a fluid sprayer (144) adapted to direct cooled fluid (38) through the moisture-laden process air (16).
The air-handling system (100) of claim 5, wherein the cooled fluid (38) is adapted to condense and remove the moisture from the moisture-laden process air (16).
The air-handling system (100) of any one or more of claims 1-6, wherein the evaporating heat exchanger (36) is disposed within a fluid tank (84) that is in communication with the shower area (40).
The air-handling system (100) of any one or more of claims 1-7, wherein the airflow path (24) includes a blower that delivers the process air (16) through the condensing heat exchanger (28), the rotating drum (20) and the shower area (40).
The air-handling system (100) of any one or more of claims 1-8, wherein the fluid (18) is directed from the shower area (40) to the evaporating heat exchanger (36) through force of gravity.
The air-handling system (100) of any one or more of claims 1-4, wherein interaction of the fluid (18) and the process air (16) leaving the rotating drum (20) is defined by a fluid sprayer (144) that delivers the fluid (18) through the process air (16) leaving the drum to wet the particulate matter (82).
The air-handling system (100) of any one or more of claims 1-6, wherein the fluid (18) leaving the shower area (40) carries moisture and particulate matter (82) from the process air (16) and through a fluid path (32) toward a fluid tank (84) and the evaporating heat exchanger (36).
The air-handling system (100) of any one or more of claims 4-11, wherein the fluid (18), moisture and particulate matter (82) are removed from the fluid tank (84) to a drain (86).
The air-handling system (100) of any one or more of claims 7-12, wherein the evaporating heat exchanger (36) is disposed within the fluid tank (84).
The air-handling system (100) of any one or more of claims 1-13, wherein fluid (18) from the spray area that dehumidifies the heated process air (30) is heated return fluid (18) that transmits retained heat to the evaporating heat exchanger (36).
A thermal exchange system (14) that operates in conjunction with the air-handling system (100) of any one or more of claims 1-14, the thermal exchange system (14) comprising:
a first heat exchange loop (130) that includes the condensing and evaporating heat exchangers (28, 36);

a second heat exchange loop (134) that heats the process air (16) at the condensing heat exchanger (28) for delivery through the rotating drum (20) and the shower area (40), sequentially; and

a third heat exchange loop (140) that cools the fluid (18) at the evaporating heat exchanger (36) for delivery to the shower area (40); wherein
the shower area (40) is defined by an interaction of the fluid (18) with the process air (16) leaving the rotating drum (20) to wash particulate matter (28) from the process air (16) leaving the rotating drum (20) and to cool and dehumidify the process air (16) leaving the rotating drum (20).